The light outside my bedroom window is bright enough that I can read my notebook without switching anything on. I discovered this at 02:17, which is not a time anyone discovers anything useful. The blind is down, but not quite. There is always a small, stubborn seam at the edge, and through that seam Madrid pours itself into the room in a steady, sodium-coloured sheet.
I used to think of streetlights as a kind of municipal kindness. You come home late, you find your keys, you don’t trip over the dog that isn’t there. Lately I’ve started to think of them as weather. Something that happens to you. Something you live inside.
When I first arrived, the nights had a soundtrack. It wasn’t loud, and it wasn’t romantic, but it was there if you lay still long enough. A few bats clipping past the roofline. The dry tick of something insect against glass. Swifts folding the day up at dusk and handing it over. Now the dominant sound is the fridge, followed closely by the distant, patient hum of traffic that never quite goes to sleep.
This is not a complaint. It’s an observation. I’ve trained myself, over a long time, to notice when the background changes.
So I tried a very small experiment, the kind that fits on a balcony and doesn’t pretend to be a paper. Four nights. Two with the blind fully down and the room properly dark. Two with that infuriating seam left exactly as it always is. I didn’t count species. I didn’t pretend to. I wrote down what I saw and what I didn’t.
On the dark nights, the glass stayed mostly honest. A moth or two found it. A bat passed once, low and fast, the way they do when they are actually hunting something and not just commuting. On the bright nights, the window became a billboard. Insects pooled at the light like loose change. They didn’t behave like insects so much as debris. The bat did not come.
This is the quiet trick of light. It does not remove habitats. It rearranges behaviour. It turns navigation into confusion, feeding into loitering, movement into orbit. Predators learn new routes. Prey forget old ones. The whole thing still looks like a city at night, which is to say, normal.
In Guinea, years ago, we used to talk about edges. Forest edge, river edge, village edge. Places where rules blur and things either thrive or get picked off. Cities are all edge, and artificial night is the hardest edge of all. It doesn’t just cut across space. It cuts across time.
There is, of course, the human argument. We like to see where we are going. We like our streets to feel safe. We like not to trip. I like these things too. I am not interested in pretending we can switch off a city and keep the city. What I am interested in is noticing what the switch does.
I walked the block the next evening and looked at the fixtures. Half of them throw light where nobody walks. Into trees. Into upper windows. Into a square of sky that doesn’t need it. This is not malice. It is design that never had to answer to anything except “more”.
Back in the flat, I taped the edge of the blind. A ridiculous, temporary fix that would not survive a determined cat, if I had one. The room went properly dark for the first time in months. I slept. In the morning, there was a moth on the outside of the glass, resting as if it had arrived somewhere rather than been arrested by brightness.
I am not making a campaign out of this. I am making notes. That is how most changes begin, if they begin at all. I’ll keep the notebook by the bed for a while. I’ll keep walking the block. I might even write to the building group and ask an unheroic question about shades and angles.
Cities teach you to accept the things that never turn off. The night is one of the few that still should.